--- title: "Trina Solar TSM-NE21 710W vs Trina Solar TSM-NEG21C.20-740 - Solar Panel Comparison | ComparePV" description: "Compare Trina Solar TSM-NE21 710W vs Trina Solar TSM-NEG21C.20-740 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-neg21c-20-740" updated: 2026-09-11 --- # Trina Solar TSM-NE21 710W vs Trina Solar TSM-NEG21C.20-740 NEG21C.20-740 leads on the differences that matter The largest is module efficiency: 0.90 pp more efficient. 10 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Trina Solar TSM-NE21 710W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-ne21-710w) | [Trina Solar TSM-NEG21C.20-740](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg21c-20-740) | | Manufacturer | Trina Solar | Trina Solar | | Power | 710 Wp | 740 Wp | | Efficiency | 22.90 % | 23.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | NE21 710W | NEG21C.20-740 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.90 % | 23.80 % | +0.90 pp for NEG21C.20-740 | | Performance warranty | 25 yrs | 30 yrs | +5 yrs for NEG21C.20-740 | | Power density | 228.6 Wp/m² | 238.2 Wp/m² | +9.7 Wp/m² for NEG21C.20-740 | | Rated power | 710 Wp | 740 Wp | +30 W for NEG21C.20-740 | | Weight | 32.9 kg | 38.3 kg | -5.4 kg for NE21 710W | | Weight per kWp | 46.3 kg/kWp | 51.8 kg/kWp | -5.4 kg/kWp for NE21 710W | | Bifacial | No | Yes | No vs Yes | | Open-circuit voltage | 49.00 V | 50.30 V | 1.30 V apart | | Voltage at max power | 40.90 V | 42.10 V | 1.20 V apart | ## Every compared parameter | Parameter | NE21 710W | NEG21C.20-740 | | --- | --- | --- | | Rated power | 710 Wp | 740 Wp | | Module efficiency | 22.90 % | 23.80 % | | Power density | 228.6 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 49.00 V | 50.30 V | | Voltage at max power | 40.90 V | 42.10 V | | Short-circuit current | 18.40 A | 18.66 A | | Current at max power | 17.36 A | 17.58 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 32.9 kg | 38.3 kg | | Weight per kWp | 46.3 kg/kWp | 51.8 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | No | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, NE21 710W:** 23,822 kWh - **Cumulative output, NEG21C.20-740:** 24,828 kWh - **Gap:** 1,006 kWh ## Output when hot | Condition | Cell temperature | NE21 710W | NEG21C.20-740 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 710 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 679 W | 708 W | 95.7% of rated power | | Typical summer roof | 55 °C | 648 W | 676 W | 91.3% of rated power | | Hot roof | 70 °C | 617 W | 643 W | 87.0% of rated power | ## Against the whole database | Measure | NE21 710W | NEG21C.20-740 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,359 | #433 | 14,005 | NEG21C.20-740 leads by 1,926 places | | Power density | #2,474 | #431 | 14,005 | NEG21C.20-740 leads by 2,043 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #1,119 | #5,125 | 14,005 | NE21 710W leads by 4,006 places | | Warranty | #9,798 | #21 | 14,005 | NEG21C.20-740 leads by 9,777 places | | Overall | #1,297 | #185 | 14,005 | NEG21C.20-740 leads by 1,112 places | ## Questions ### Which panel is better: Trina Solar TSM-NE21 710W or Trina Solar TSM-NEG21C.20-740? According to our database: **Trina Solar TSM-NEG21C.20-740** has higher module efficiency (**23.80%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Trina Solar TSM-NE21 710W and Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-NE21 **710 W**** has a module efficiency of **22.90%**, while **Trina Solar TSM-NEG21C.20-740** is **23.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Trina Solar TSM-NE21 710W use vs Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-NE21 **710 W**** uses **TOPCon** cells; **Trina Solar TSM-NEG21C.20-740** uses **TOPCon**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Trina Solar TSM-NE21 710W and Trina Solar TSM-NEG21C.20-740? **Trina Solar TSM-NE21 **710 W**** has a **25 years** power warranty; **Trina Solar TSM-NEG21C.20-740** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are Trina Solar TSM-NE21 710W and Trina Solar TSM-NEG21C.20-740 bifacial panels? **Trina Solar TSM-NEG21C.20-740** is bifacial (captures light from both faces); **Trina Solar TSM-NE21 **710 W**** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 725W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-725w) - 3 differences, the largest is module efficiency - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 720W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-720w) - 3 differences, the largest is module efficiency - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 715W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-715w) - The same specification on paper - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 705W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-705w) - One difference: module efficiency - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 700W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-700w) - 3 differences, the largest is module efficiency - [Trina Solar TSM-NE21 710W vs Trina Solar TSM-NE21 695W](https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-ne21-695w) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/trina-solar-co-ltd-tsm-ne21-710w/trina-solar-co-ltd-tsm-neg21c-20-740 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.